The reason their karma goes unaffected is because only one person orders everyone around. Only that person is affected. With a job like that I can see he gets the karma paid back by just having the position. It would be the worst to have to tell everyone else to be evil.

Romans 5:19 For as through the one man's disobedience many were made sinners, even so through the obedience of the one, many will be made righteous.